GtkTextView and PangoFcDecoder

[Ferdinand Ramirez <ramirez ferdinand yahoo com>]

Is it possible to use PangoFcDecoder with GtkTextView so that I can use the glyph index to render the glyphs? 
If so, at what point does the program invoke the callback provided as a parameter in 
pango_fc_font_map_add_decoder_find_func? 

The documentation says it is called during create_font and the examples I see use GnomeCanvas. However, my 
program does not use GnomeCanvas. I am not sure if GnomeCanvas is related to GtkTextView. I am looking for 
the best way to render my glyphs based on glyph index in an already existing program that is based on 
GtkTextView.

-Ferdinand